The UNISync PRS is a low profile
(1U chassis) GPS primary reference source (PRS) that supplies two
Stratum 1 timing references to a co-located Central Office
BITS clock. It can also be used in a typical Small Office installation
to function as a Multiple Output Mini-Timing
Distribution Clock. It
can provide timing distribution for up to 12 co-located
Network Elements when equipped with the optional expansion card.
The user can order the PRS with either a standard ST3E
Quartz local oscillator or a ST2 Rubidium oscillator for
enhanced holdover and filtering capabilities. If the user
desires additional redundancy for input references, the PRS
can be equipped with one or two Universal Input Daughter
cards which will allow external references to be terminated
to the PRS. In the event that GPS connectivity is
temporarily lost the input reference will automatically
switch to whatever Stratum traceable reference is terminated
to the clock. Some network operators actually prefer to use
their internal network sync references as primary and to
rely on the GPS references as the secondary. In any case the
options all lie with the user.

The
UNISync PRS supplies up to 12 frequency outputs; DS1,
Composite Clock, or E1. It also provides NTP or SNTP to
network clients. The back panel outputs also include two
analog outputs programmable for 1, 5, or 10 MHz, a 1 PPS,
and Time of Day.

Fully manageable over IP network
links, the input signal formats are software
provisionable and the unit supports multiple communications
interfaces as well as simultaneous system management or
Telnet sessions. The UNISync PRS
can be managed in software using either a TL-1
Command Line or a standard Graphical User Interface, providing the
user with provisioning flexibility, alarm management,
troubleshooting convenience, and system administration
functions.

The GPS antenna architecture
utilizes a signal frequency down converter normally located
near the point of entry of the antenna cable, which comes
through a lightening arrestor
from the external antenna mount. This architecture allows
the converted frequency reference to be transmitted through
up to 1,000 feet of RG-59 coax without additional signal
amplification required. The system offers an optional
sub-rooftop, exterior wall mount antenna.

In short the UNISync PRS is a
workhorse GPS reference receiver capable of many years of
reliable service. It is currently deployed at carrier
networks worldwide to drive telecom
network synchronization.
Compact, reliable, and featuring software management
capabilities common to much more complex and sophisticated
network sync systems; this PRS is the foundation timing
reference in
countless networks.